CN108877657A - Luminance compensation method and device, display device - Google Patents

Abstract

The disclosure provides a brightness compensation method and device, and a display device, so as to realize compensation for the brightness of sub-pixels in the display device and improve the brightness uniformity of pixels. Wherein the brightness compensation method includes a process of establishing and updating a curve and a compensation process which are performed simultaneously. For each sub-pixel, the process of establishing and updating the curve includes: detecting the actual brightness of the sub-pixel in real time; establishing and updating the actual brightness curve of the actual brightness value of the sub-pixel changing with the gray scale value. The compensation process includes: obtaining the ideal luminance value corresponding to the gray scale value to be output by the sub-pixel; calculating the gray-scale value corresponding to the actual luminance value equal to the obtained ideal luminance value according to the actual luminance curve of the sub-pixel; The scale value is used as the actual output gray scale value. The brightness compensation method described above is applied to OLED display devices, and can solve the problem of non-uniform brightness of sub-pixels caused by aging of light-emitting devices.

Description

Brightness compensation method and device, display device

technical field

The present disclosure relates to the field of display technology, and in particular, to a brightness compensation method and device, and a display device.

Background technique

OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode) display devices are more and more concerned and favored by the display industry due to their characteristics such as self-illumination, high contrast, high color gamut, wide viewing angle, light and thin structure, and compatibility and flexibility.

The sub-pixels in the OLED display device realize grayscale display through the luminance of the corresponding OLED light-emitting device. Due to the material characteristics of the light-emitting material inside the OLED light-emitting device, the OLED light-emitting device will experience aging problems to varying degrees with the prolongation of use time, resulting in a decrease in the brightness uniformity of the sub-pixels.

In order to ensure the display uniformity of the OLED display device, it is necessary to compensate the brightness of the sub-pixels.

Contents of the invention

In view of the above-mentioned problems in the prior art, the embodiments of the present disclosure provide a brightness compensation method and device, and a display device, so as to realize compensation for the brightness of sub-pixels in the display device and improve the brightness uniformity of pixels.

In order to achieve the above purpose, the embodiments of the present disclosure adopt the following technical solutions:

In a first aspect, an embodiment of the present disclosure provides a brightness compensation method, the brightness compensation method includes: a curve creation and update process and a compensation process, both of which are performed simultaneously. Wherein, for each sub-pixel in the display device, the process of establishing and updating the curve includes: detecting the actual brightness of the sub-pixel in real time; The actual luminance curve of the step value changes, and the actual luminance curve is updated. The compensation process includes: obtaining an ideal brightness value corresponding to the grayscale value to be output by the sub-pixel; wherein, the ideal brightness value is the brightness value when the light-emitting device in the sub-pixel is not aged; according to the For the actual luminance curve of the sub-pixel, the gray scale value corresponding to when the actual luminance value is equal to the obtained ideal luminance value is calculated, and the gray scale value is used as the actual output gray scale value.

In the brightness compensation method described above, by detecting the actual brightness of the sub-pixel in real time, an actual brightness curve is generated according to the actual brightness value detected in real time. The detected luminance value updates the actual luminance curve, so that the actual luminance curve can reflect the current real luminous luminance of the sub-pixel driven by grayscale data. The real luminous luminance may include the aging of the light-emitting device in the sub-pixel. The luminance of the luminous light is reduced relative to the ideal luminance. It can be seen that the above actual luminance curve can reflect the aging condition of the light emitting device in the sub-pixel.

When the sub-pixel is compensated, the ideal luminance value corresponding to the gray scale value to be output is obtained, and then according to the actual luminance curve of the sub-pixel, the corresponding gray scale value when the actual luminance value is equal to the obtained ideal luminance value is calculated. Since the actual luminance curve reflects the aging condition of the light-emitting device in the sub-pixel, the finally obtained grayscale value actually refers to the gray-scale value corresponding to the gray-scale value to be displayed by the sub-pixel based on the current aging condition of the light-emitting device in the sub-pixel. The ideal brightness value of , and the actual grayscale value that should be output. Therefore, the finally obtained gray scale value is outputted to obtain an ideal brightness value, which realizes real-time and effective compensation of the brightness of the sub-pixel, and improves the brightness uniformity of the sub-pixel.

Optionally, the step of establishing an actual brightness curve in which the actual brightness value of the sub-pixel changes with the gray scale value according to the actual brightness value obtained by real-time detection, and updating the actual brightness curve includes: at the initial stage, The actual brightness curve is established according to the actual brightness value obtained by real-time detection; based on the established actual brightness curve, the actual brightness curve is continuously updated according to the actual brightness value obtained by real-time detection.

Optionally, at the initial stage, the step of establishing the actual brightness curve according to the actual brightness value obtained by real-time detection includes: S121: setting at least two marked gray scale values; S122: setting the actual brightness value obtained by real-time detection The brightness value is converted into a corresponding gray-scale value; S123: judge whether the converted gray-scale value is one of the at least two marked gray-scale values: if yes, record the actual brightness value corresponding to the marked gray-scale value, Go to step S124, if no, return to step S122; S124: judge whether the corresponding actual brightness values have been recorded for all the marked gray scale values: if yes, then according to all the marked gray scale values and their respective corresponding The actual luminance value is fitted to establish the actual luminance curve, if not, return to step S122.

Optionally, the step of continuously updating the actual brightness curve according to the actual brightness value obtained by real-time detection based on the established actual brightness curve includes: S125: Converting the actual brightness value obtained by real-time detection into a corresponding grayscale value; S126: judge whether the converted grayscale value is one of the at least two marked grayscale values: if yes, update the actual brightness value corresponding to the marked grayscale value to the currently detected If not, return to step S125; S127: According to the marked gray scale value and its corresponding updated actual brightness value, and the remaining marked gray scale values and their respective corresponding actual brightness values The luminance value is re-fitted to obtain the updated actual luminance curve, and the process returns to step S125.

Optionally, in step S124 and step S127, the fitting includes: using all the marked gray scale values and their respective corresponding actual brightness values as multiple points on the actual brightness curve to be fitted, each A linear function is used to fit a line segment between two adjacent points, and all the fitted line segments are combined to obtain the actual brightness curve.

Optionally, the step of calculating, according to the actual brightness curve of the sub-pixel, the corresponding gray scale value when the actual brightness value is equal to the acquired ideal brightness value, and using the gray scale value as the actual output gray scale value, Including: determining the line segment where the obtained ideal brightness value corresponds to the point on the actual brightness curve; according to the coordinate values of the two endpoints of the determined line segment, calculating the corresponding when the actual brightness value is equal to the obtained ideal brightness value grayscale value.

Optionally, the set value range of the number of marked gray scale values is: greater than or equal to 2, less than or equal to the maximum number of gray scales that can be displayed by the sub-pixel.

Optionally, the step of detecting the actual brightness of the sub-pixel in real time includes: sensing the brightness of the sub-pixel in real time; acquiring the sensed brightness data at least twice within a frame time to obtain at least two sets of brightness data, and determine the photosensitive duration corresponding to each group of brightness data; according to the current gray scale of the sub-pixel, determine the duration required for sensing the brightness of the sub-pixel at the current gray scale, which is recorded as t0; from Among the at least two groups of luminance data, a group of luminance data whose exposure duration is closest to t0 is selected, and this group of luminance data is used as the detected actual luminance of the current frame of the sub-pixel.

Optionally, within one frame time, the number of times to acquire the sensed brightness data is 3 to 6 times, to obtain 3 to 6 sets of brightness data.

Optionally, the step of acquiring the ideal luminance value corresponding to the gray scale value to be output by the sub-pixel includes: reading the ideal luminance curve of the pre-stored ideal luminance value of the sub-pixel changing with the gray scale value , from which the ideal brightness value corresponding to the gray scale value to be output by the sub-pixel is found.

Optionally, the brightness compensation method further includes the step of establishing the ideal brightness curve, which step includes: testing the ideal brightness of the sub-pixel at different gray scales when the light-emitting device of the sub-pixel is not aged, Obtaining at least two sets of correspondence relationship data between gray scale values and ideal brightness values, performing fitting according to the correspondence relationship data between the at least two sets of gray scale values and ideal brightness values, to obtain the ideal brightness curve.

In the second aspect, the embodiments of the present disclosure provide a brightness compensation device, the brightness compensation device includes: a plurality of photosensitive components, respectively corresponding to a plurality of sub-pixels of the display device, and the photosensitive components are used for real-time sensing The brightness of the corresponding sub-pixel; the first memory connected to the plurality of photosensitive components is used to establish the actual brightness value of each sub-pixel according to the real-time actual brightness value of each sub-pixel change the actual brightness curve, and update the actual brightness curve, and store the latest actual brightness curve of each of the sub-pixels; the second memory stores the ideal brightness value of each of the sub-pixels along with the grayscale value A changing ideal luminance curve; wherein, the ideal luminance value is the luminous luminance value when the light-emitting device in the corresponding sub-pixel is not aged; a compensation calculator connected to the first memory and the second memory is used to obtain from From the ideal luminance curve of each sub-pixel, find the ideal luminance value corresponding to the gray scale value to be output by the corresponding sub-pixel, and calculate when the actual luminance value is equal to the acquired ideal luminance value according to the actual luminance curve of the corresponding sub-pixel The corresponding gray scale value is used as the gray scale value that the corresponding sub-pixel should actually output in the current frame.

The beneficial effects produced by the brightness compensation device described above are the same as those of the brightness compensation method provided in the first aspect, and will not be repeated here.

Optionally, the brightness compensation device further includes: an actual brightness value judging component connected between the plurality of photosensitive components and the first memory, for each of the photosensitive components, at a time of one frame In the process, the sensed brightness data is acquired at least twice to obtain at least two groups of brightness data, and one group of brightness data is selected from the at least two groups of brightness data as the actual brightness value of the current frame of the corresponding sub-pixel.

In a third aspect, an embodiment of the present disclosure provides a computer product, including one or more processors configured to run computer instructions to perform one of the brightness compensation methods described in the first aspect or multiple steps.

The beneficial effects produced by the above-mentioned computer products are the same as those of the brightness compensation method provided in the first aspect, and will not be repeated here.

In a fourth aspect, embodiments of the present disclosure provide a display device, the display device including the brightness compensation device as described in the second aspect.

The beneficial effects produced by the above display device are the same as those of the brightness compensation method provided in the first aspect, and will not be repeated here.

In the fifth aspect, the embodiments of the present disclosure provide a display substrate, including a plurality of sub-pixels; the display substrate further includes: a plurality of photosensitive components, respectively corresponding to the plurality of sub-pixels, and the photosensitive components use real-time sensing The brightness of the corresponding sub-pixel; a plurality of driving lines, each of which is connected to the input end of at least one of the photosensitive components, and is used to drive the corresponding photosensitive component for brightness sensing; a plurality of sensing lines, each of which The sensing line is connected to the output end of at least one of the photosensitive components for collecting brightness sensing data of the corresponding photosensitive component.

The beneficial effects produced by the above-mentioned display substrate are the same as those of the brightness compensation method provided in the first aspect, and will not be repeated here.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present disclosure. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a basic flowchart of a brightness compensation method provided by an embodiment of the present disclosure;

FIG. 2 is a specific flow chart of the curve establishment and update process in the brightness compensation method provided by the embodiment of the present disclosure;

FIG. 3 is a timing diagram of acquiring brightness data in the brightness compensation method provided by an embodiment of the present disclosure;

4 is a schematic diagram of an actual luminance curve established in the luminance compensation method provided by an embodiment of the present disclosure;

FIG. 5 is a specific flow chart of the compensation process in the brightness compensation method provided by the embodiment of the present disclosure;

FIG. 6 is a basic structural diagram of a brightness compensation device provided by an embodiment of the present disclosure;

FIG. 7 is a partial plan view of a display substrate provided by an embodiment of the present disclosure.

Explanation of reference signs:

100-brightness compensation device; 1-photosensitive component;

2-first memory; 3-second memory;

4-compensation calculator; 5-actual brightness judgment component;

200-grayscale data output module; 300-display screen;

6-drive line; 7-induction line;

8-subpixel.

Detailed ways

In order to make the above objects, features and advantages of the present disclosure more comprehensible, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

Some embodiments of the present disclosure provide a brightness compensation method to realize brightness compensation for each sub-pixel in a display device. It should be noted that the brightness compensation method provided by the embodiments of the present disclosure can be applied to a display device having the following structure: the display device is a self-luminous display device, for example, an OLED display device, and the display device includes a plurality of sub-pixels, each Each sub-pixel includes a light-emitting device; in addition, each sub-pixel is correspondingly provided with a device for sensing the luminance of the corresponding sub-pixel, such as an optical sensor, so that the optical sensor can be used to sense the sub-pixel in real time (specifically, the light-emitting device of the sub-pixel ), the sensed real-time brightness data is the basis for calculation when the brightness compensation method provided by the embodiments of the present disclosure actually performs compensation.

The brightness compensation method provided by the embodiments of the present disclosure will be introduced below. As shown in FIG. 1 , the brightness compensation method includes two processes: a curve establishment and update process and a compensation process, and the two processes are performed simultaneously.

For each sub-pixel in the display device, as shown in Figure 2, the curve creation and update process includes the following steps:

S11: Detect the actual brightness of the sub-pixel in real time.

As a possible implementation, referring to FIG. 2, the above step S11 may include the following steps:

S111: Sensing the brightness of the sub-pixel in real time.

In some embodiments, an optical sensor corresponding to each sub-pixel can be used to sense the brightness of the sub-pixel in real time, and the brightness data generated by the optical sensor sensing the brightness is real-time and can be constantly changing.

S112: Acquire the sensed luminance data at least twice within a frame time to obtain at least two sets of luminance data, and determine a photosensitive duration corresponding to each set of luminance data.

Since optical sensors require different photosensitive durations for different ranges of brightness: for lower brightness, a longer photosensitive duration is required, and for higher brightness, a shorter photosensitive duration is required, so based on this characteristic of the optical sensor , the light-sensing data can be acquired at different time points within one frame, and the brightness data sensed by the optical sensor at different light-sensing time lengths can be obtained.

Exemplarily, within one frame time, the number of times to acquire the sensed brightness data may be 3 to 6 times, so that 3 to 6 groups of brightness data may be obtained. Please refer to FIG. 3 , which shows a timing sequence for acquiring luminance data multiple times within one frame, wherein the VS (Vertical Sync, vertical synchronization) signal is a frame synchronization signal, and the time between two VS signal pulses represents one frame; The control signal is a synchronous signal for brightness data acquisition, and one control signal pulse represents the execution of one brightness data acquisition; the brightness data represents the sensing data sent back from the optical sensor to the timing controller (TCON) of the display device. In Figure 3, the optical sensor sends back five sets of brightness data to the timing controller (TCON) within one frame, and the five sets of brightness data correspond to the light-sensing durations of t1, t2, t3, t4, and t5.

S113: According to the current gray scale of the sub-pixel, determine the time required for sensing the brightness of the sub-pixel at the current gray scale, which is recorded as t0.

In the above steps, the current gray scale of the sub-pixel can be obtained from the driver chip (Diver IC) of the display device, and the brightness of the current frame of the sub-pixel can be estimated according to the acquired current gray scale of the sub-pixel. According to the principle that optical sensors require different light-sensing durations for different ranges of brightness, the time t0 required for the sub-pixel to sense the brightness at the current gray scale can be estimated, and the light-sensing time is proportional to the brightness of the sub-pixel at the current gray scale. Inversely proportional relationship: the lower the brightness of the sub-pixel at the current gray scale, the longer the photosensitive time required; the higher the brightness of the sub-pixel at the current gray scale, the shorter the photosensitive time required.

S114: From the at least two groups of brightness data, select a group of brightness data whose exposure duration is closest to t0, and use this group of brightness data as the detected actual brightness of the current frame of the sub-pixel.

In the above steps, please refer to Fig. 3 again, assuming that the five sets of luminance data obtained respectively correspond to the photosensitive durations of t1, t2, t3, t4, t5, among which t2 is the closest to t0 determined in step S113, then The brightness data obtained when the photosensitive duration is t2 is the closest to the actual brightness of the current frame of the sub-pixel, that is, among the five sets of brightness data obtained, the brightness data obtained when the photosensitive duration is t2 Highest accuracy.

By executing steps S111 to S114, the real-time sensing data of the optical sensor is acquired multiple times at different time points within one frame, and multiple sets of brightness data are obtained. From the multiple sets of brightness data, the light-sensing duration closest to t0 is selected (the sub-pixel is in the current gray The time required for sensing the luminance under the order) is used as the actual luminance of the detected sub-pixel current frame, thereby improving the accuracy of the detected actual luminance value of the sub-pixel, which is conducive to improving the accuracy of the sub-pixel The accuracy and effectiveness of brightness compensation.

S12: According to the actual luminance value obtained by real-time detection, an actual luminance curve in which the actual luminance value of the sub-pixel changes with the gray scale value is established, and the actual luminance curve is updated.

As a possible implementation, please refer to FIG. 2 again, the above step S12 may include the following process:

(1) Curve establishment stage: in the initial stage, according to the actual luminance value obtained by real-time detection, the actual luminance curve is established;

(2) Curve update stage: based on the established actual brightness curve, the actual brightness curve is continuously updated according to the actual brightness value obtained by real-time detection.

Wherein, in some embodiments, as shown in Figure 2, (1) the curve building phase may include the following steps:

S121: Set at least two gray scale values of the mark.

In this step, the value range of the number of gray scale values set is: greater than or equal to 2, less than or equal to the maximum number of gray scales that can be displayed by a sub-pixel; for example, assuming that the gray scale that a sub-pixel can display The maximum number of is 256, then the set value range of the number of gray scale values of the marker is greater than or equal to 2 and less than or equal to 256. Exemplarily, in this step, four marker gray scale values are set, respectively denoted as: G ₁ , G ₂ , G ₃ , and G ₄ .

S122: Convert the actual brightness value detected in real time into a corresponding gray scale value.

In this step, for the actual luminance value of each frame detected in real time, the grayscale value of the frame corresponding to the sub-pixel can be obtained from the driver chip of the display device, and the conversion between the actual luminance value and the corresponding grayscale value can be realized .

S123: Determine whether the converted grayscale value is one of the at least two marked grayscale values: if yes, record the actual brightness value corresponding to the marked grayscale value, and enter step S124; if not, return to step S123 S122.

S124: Determine whether the corresponding actual brightness values have been recorded for all the marked gray scale values: if so, perform fitting according to all the marked gray scale values and their respective corresponding actual brightness values, and establish the actual brightness curve; if not, return to step S122.

Through steps S123 and S124, the actual luminance values corresponding to all marked gray scale values can be obtained, thereby obtaining several points on the actual luminance curve where the actual luminance values vary with the gray scale values to be established, and then use these obtained points After fitting, the actual luminance curve can be established. Exemplarily, it is assumed that there are four marked gray scale values: G ₁ , G ₂ , G ₃ , G ₄ , the actual brightness value corresponding to the marked gray scale value G ₁ is L ₁ , and the actual brightness value corresponding to the marked gray scale value G ₂ is value is L ₂ , the actual luminance value corresponding to the marked gray scale value G ₃ is L ₃ , and the actual luminance value corresponding to the marked gray scale value G ₄ is L ₄ , then we know that the four points on the actual luminance curve to be established are respectively (G ₁ , L ₁ ), (G ₂ , L ₂ ), (G ₃ , L ₃ ), (G ₄ , L ₄ ), and the actual brightness curve can be obtained by fitting according to these four points.

In some embodiments, in the above step S124, the following process may be used for fitting: use a function fitting between every two adjacent points to obtain a line segment, and combine all the fitted line segments to obtain an actual brightness curve. Exemplarily, as shown in Figure 4, if the obtained points are four: (G ₁ , L ₁ ), (G ₂ , L ₂ ), (G ₃ , L ₃ ), (G ₄ , L ₄ ) , then point (G ₁ , L ₁ ) and (G ₂ , L ₂ ) perform a function fitting to obtain a line segment, and point (G ₂ , L ₂ ) and (G ₃ , L ₃ ) perform a function fitting to obtain a line segment Line segment, point (G ₃ , L ₃ ) and (G ₄ , L ₄ ) are fitted with a function to get a line segment, and the actual brightness curve of the segment can be obtained by connecting the obtained three line segments; it should be noted that the actual brightness The rest of the curve (for example, the curve part corresponding to the grayscale value smaller than _G1 , and the curve part corresponding to the grayscale value greater than G4 ₎ can be obtained by extrapolation.

Through steps S121-S124, an actual brightness curve can be established at the initial stage when the light emitting device in the sub-pixel is working, and the actual brightness curve established at this time is the actual brightness of the light emitting device in the sub-pixel under the current aging condition curve. With the prolongation of the service time of the light emitting device in the sub-pixel, the light-emitting device gradually ages, and the actual brightness of the sub-pixel under the same gray scale gradually decreases. It deviates from the actual situation, so it is necessary to continuously update the established actual brightness curve according to the real-time actual brightness of the sub-pixels, so that the aging degree of the light-emitting device reflected by the updated actual brightness curve can be as close as possible or even in line with the actual aging of the light-emitting device degree.

In some embodiments, as shown in Figure 2, (2) the curve update phase may include the following steps:

S125: Convert the actual brightness value detected in real time into a corresponding gray scale value.

In this step, for the actual luminance value of each frame detected in real time, the grayscale value of the frame corresponding to the sub-pixel can be obtained from the driver chip of the display device, and the conversion between the actual luminance value and the corresponding grayscale value can be realized .

S126: Determine whether the converted grayscale value is one of the at least two marked grayscale values: if yes, update the actual brightness value corresponding to the marked grayscale value to the currently detected actual brightness value, Enter step S127; if no, return to step S125.

In this step, if the aging degree of the light-emitting device in the sub-pixel is worse than the aging degree when the actual brightness curve is established before, the actual brightness value corresponding to the marked gray scale value in the actual brightness curve will change. When the actual luminance value corresponding to the marked gray scale value is detected, the actual luminance value corresponding to the marked gray scale value is updated from the gray scale value based on the previous establishment of the actual luminance curve to the currently detected actual luminance value, This is equivalent to summing and updating the point corresponding to the marked gray scale value on the actual luminance curve. Exemplarily, if the currently detected actual luminance value is L ₂ ′, which corresponds to the marked gray scale value G ₂ , then the actual luminance value L ₂ corresponding to the marked gray scale value G ₂ is updated to L ₂ ′, that is, The point (G ₂ , L ₂ ) on the actual luminance curve is updated as the point (G ₂ , L ₂ ′).

S127: According to the marked gray scale value and its corresponding updated actual luminance value, and other marked gray scale values and their respective corresponding actual luminance values, re-fit to obtain the updated actual luminance curve , return to step S125.

In this step, by obtaining the actual luminance value based on real-time detection, the points on which the fitting is based are continuously updated, so as to realize the update of the actual luminance curve, so that the updated actual luminance curve can always reflect the luminance in the sub-pixel The latest aging degree of the device is conducive to improving the accuracy and effectiveness of brightness compensation.

Exemplarily, assuming that point (G ₂ , L ₂ ) is updated to point (G ₂ , L ₂ ′), according to points (G ₁ , L ₁ ), (G ₂ , L ₂ ′), (G ₃ , L ₃ ), (G ₄ , L ₄ ) are re-fitted to obtain the actual brightness curve, thereby realizing the update of the actual brightness curve. In some embodiments, the fitting in this step may adopt the following process: a function is fitted between every two adjacent points to obtain a line segment, and all the fitted line segments are combined to obtain an actual brightness curve. The linear function fitting process is similar to the linear function fitting process in step S124, and will not be repeated here.

The above is the introduction of the curve establishment and update process in the brightness compensation method, and the compensation process in the brightness compensation method will be introduced below.

For each sub-pixel in the display device, as shown in Figure 5, the compensation process includes the following steps:

S21: Obtain an ideal brightness value corresponding to the gray scale value to be output by the sub-pixel. Wherein, the ideal brightness value is a brightness value when the light emitting device in the sub-pixel is not aged.

As a possible implementation, please refer to FIG. 2, the above step S21 may include the following process:

S211: Read a pre-stored ideal brightness curve in which the ideal brightness value of the sub-pixel varies with the gray scale value.

In this step, the pre-stored ideal brightness curve can be stored in the memory of the display device before leaving the factory. In some embodiments, the provided brightness compensation method further includes the step of establishing an ideal brightness curve, which includes the following process: when the light-emitting device of the sub-pixel is not aged (it may be before the display device leaves the factory, the display device at this stage , since it has not been formally used, it can be considered that the light-emitting device of its sub-pixel is not aging), test the ideal brightness of the sub-pixel under different gray scales, and obtain at least two sets of corresponding relationship data between gray scale values and ideal brightness values; according to the test, The corresponding relationship data between the at least two groups of gray scale values and ideal brightness values are fitted to obtain an ideal brightness curve. Wherein, the fitting performed may be a linear function fitting. The number of groups of data corresponding to the relationship between the gray scale value and the ideal brightness value obtained from the test can be selected according to actual needs. The more groups, the more accurate the ideal brightness curve finally obtained.

S212: Find the ideal brightness value corresponding to the gray scale value to be output by the sub-pixel from the ideal brightness curve.

In this step, the meaning of the found ideal brightness value is: when the light-emitting device in the sub-pixel is not aged, the brightness value that the sub-pixel should reach under the gray scale value to be output currently.

In the compensation process, after step S21, step S22 is also included: according to the actual luminance curve of the sub-pixel, calculate the corresponding gray scale value when the actual luminance value is equal to the obtained ideal luminance value, and use the gray scale value as the actual output grayscale value.

Through step S22, under the actual output gray scale value, the luminous brightness of the sub-pixel can reach the desired ideal luminance value of the current frame, thereby realizing real-time compensation of sub-pixel luminance and improving the uniformity of display luminance.

Please refer to FIG. 5. In some embodiments, assuming that the actual brightness curve is obtained by fitting a linear function, step S22 may include the following steps:

S221: Determine the line segment where the acquired ideal luminance value corresponds to the point on the actual luminance curve.

Please refer to Figure 4. In this step, it is assumed that the fitting is based on four points: (G ₁ , L ₁ ), (G ₂ , L ₂ ), (G ₃ , L ₃ ), (G ₄ , L ₄ ) , the obtained ideal luminance value is L, L ₂ ≤ L ≤ L ₃ , then it can be determined that the line segment corresponding to the point on the actual luminance curve of the ideal luminance value L is point (G ₂ , L ₂ ) and point (G ₃ , L ₃ ).

S222: According to the determined coordinate values of the two endpoints of the line segment, calculate the corresponding grayscale value when the actual brightness value is equal to the acquired ideal brightness value.

Please refer to Fig. 4. In this step, assuming that the actual luminance value is equal to the obtained ideal luminance value L, the corresponding grayscale value is G, and the calculation process of G is as follows:

First, calculate the functional expression of the line segment between the point (G ₂ , L ₂ ) and the point (G ₃ , L ₃ ): L=kG+b. in, get

Then, L is known, and it is substituted into the function expression of the above line segment to obtain:

From the above formula (1), it can be obtained: Assume that the line segment corresponding to the point corresponding to the ideal brightness value L on the actual brightness curve is the distance between the point (G _n , L _n ) and the point (G _n+1 , L _n+1 ). Line segment, n≥1, then the corresponding grayscale value G when the actual brightness value is equal to the obtained ideal brightness value L can be calculated according to the following formula (2):

The brightness compensation method provided by the embodiments of the present disclosure detects the actual brightness of the sub-pixel in real time, generates and continuously updates the actual brightness curve of the actual brightness value of the sub-pixel as the gray scale value changes according to the actual brightness value detected in real time, so that the actual brightness The curve can reflect the current real luminous brightness of the sub-pixel driven by the gray scale data, so as to represent the aging of the light-emitting device in the sub-pixel. When the sub-pixel is compensated, the ideal brightness value corresponding to the gray-scale value to be output is obtained, and then according to the actual brightness curve of the sub-pixel, the corresponding gray-scale value is calculated when the actual brightness value is equal to the obtained ideal brightness value, Therefore, an ideal luminance value can be obtained by outputting the calculated gray scale value, which realizes real-time and effective compensation of the luminance of the sub-pixel, and improves the luminance uniformity of the sub-pixel.

In some other embodiments of the present disclosure, a brightness compensation device is provided. As shown in FIG. 6 and FIG. Compensation Calculator4.

Wherein, the plurality of photosensitive components 1 are arranged corresponding to the plurality of sub-pixels 8 of the display device, in some embodiments, each sub-pixel 8 is provided with at least one photosensitive component 1, and the photosensitive component 8 senses its corresponding For the brightness of the sub-pixel 8 , for example, the photosensitive component 8 may use an optical sensor.

The first memory 2 is connected to the plurality of photosensitive components 6, and the first memory 2 is used to establish an actual luminance curve in which the actual luminance value of each sub-pixel 8 varies with the gray scale value according to the real-time actual luminance value of each sub-pixel 8, And update the actual luminance curve, and store the latest actual luminance curve of each sub-pixel 8 . The process of establishing and updating the actual luminance curve by the first memory 2 can refer to the relevant description of step S12 in the above-mentioned luminance compensation method, which will not be repeated here.

The second memory 3 stores an ideal brightness curve in which the ideal brightness value of each sub-pixel 8 varies with the gray scale value. It should be noted that the ideal luminance value is the luminous luminance value when the light emitting device in the corresponding sub-pixel 8 is not aged. The ideal luminance curve can be obtained and stored in advance through testing before the display device leaves the factory (that is, when the light-emitting device is not aged). No longer.

The compensation calculator 4 is connected to the first memory 2 and the second memory 3, and the compensation calculator 4 is used to read the actual luminance curve from the first memory 2, and read the ideal luminance curve from the second memory 3, and from each sub-pixel Find the ideal brightness value corresponding to the gray scale value to be output by the corresponding sub-pixel 8 from the ideal brightness curve of 8, and calculate the corresponding value when the actual brightness value is equal to the obtained ideal brightness value according to the actual brightness curve of the corresponding sub-pixel 8. A grayscale value, which is used as the grayscale value that the corresponding sub-pixel 8 should actually output in the current frame. For the specific calculation process, please refer to the relevant descriptions about steps S21 and S22 in the brightness compensation method mentioned above, which will not be repeated here.

It should be noted that, for the acquisition of the grayscale value to be output by the sub-pixel 8, in some embodiments, the compensation calculator 4 can be connected to the grayscale data output module 200 for outputting grayscale data in the display device, so that The compensation calculator 4 can obtain the grayscale value to be output by the sub-pixel 8 from the grayscale data output module 200 . Further, after the compensation calculator 4 calculates and obtains the gray scale value (that is, the compensated gray scale value) that the sub-pixel 8 should actually output in the current frame, the compensation calculator 4 transmits the compensated gray scale value to the gray scale data The output module 200, the gray scale data output module 200 outputs the compensated gray scale value to the display screen 300 of the display device. In some embodiments, the grayscale data output module 200 can be integrated on the driver chip of the display device, and the first memory 2 , the second memory 3 and the compensation calculator 4 can also be integrated on the driver chip.

Please continue to refer to FIG. 6 , in some other embodiments, the above-mentioned brightness compensation device 100 may further include an actual brightness value judging unit 5 connected between the plurality of photosensitive components 1 and the first memory 2, the actual brightness value judging unit 5 5. For each photosensitive component 1, acquire the brightness data sensed by the photosensitive component 1 at least twice within a frame time to obtain at least two sets of brightness data, and select one set from the at least two sets of brightness data The brightness data is used as the actual brightness value of the corresponding sub-pixel 8 in the current frame. For the specific working process of the actual luminance value judging unit 5 , please refer to the relevant description about step S11 in the above-mentioned luminance compensation method, and details will not be repeated here. It should be noted that the actual brightness value judging unit 5 can be integrated on the driving chip of the display device.

In some embodiments of the present disclosure, a computer product is provided, including one or more processors configured to run computer instructions to perform the brightness compensation method described in the embodiments of the present disclosure. One or more steps to realize real-time compensation for the brightness of the sub-pixels of the display device.

In some other embodiments of the present disclosure, a display device is provided, and the display device includes the brightness compensation device as described in the embodiments of the present disclosure, so as to realize real-time compensation for brightness of sub-pixels of the display device. As a possible implementation manner, the display device may be an OLED display device.

In some other embodiments of the present disclosure, a display substrate is provided. As shown in FIG. 7 , the display substrate includes a plurality of sub-pixels 8 , a plurality of photosensitive components 1 , a plurality of driving lines 6 and a plurality of sensing lines 7 . Wherein, the plurality of photosensitive components 1 are arranged correspondingly to the plurality of sub-pixels 8, in some embodiments, each sub-pixel 8 is provided with at least one photosensitive component 1, and the photosensitive component 8 senses its corresponding Brightness of sub-pixel 8. Each driving line 6 is connected to the input end of at least one photosensitive component 8 , and the driving line 6 is used to drive the corresponding photosensitive component 8 for brightness sensing. Each sensing line 7 is connected to the output end of at least one photosensitive component 8 , and the sensing line 7 is used to collect brightness sensing data of the corresponding photosensitive component 8 . Through this structural design, the real-time actual luminance value of each sub-pixel 8 can be obtained, and the actual luminance value is used as a calculation basis for real-time compensation of the luminance of the sub-pixel 8 .

As a possible design, the photosensitive component 8 can be a photosensor, and the photosensor includes an anode and a cathode, so the driving line 6 can be connected to the anode of the photosensor, and the sensing line 7 can be connected to the cathode of the photosensor.

Please refer to FIG. 7 again. As a possible design, for the arrangement of pixels arranged in a matrix with multiple rows and multiple columns, the photosensitive component 8 corresponding to each row of sub-pixels can be connected to the same driving line 6, and each The photosensitive components 8 corresponding to the sub-pixels in a column may be connected to the same sensing line 7 .

The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure are all should fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be determined by the protection scope of the claims.

Claims (16)

1. A luminance compensation method, characterized in that the luminance compensation method comprises: the curve establishment and updating process and the compensation process are carried out simultaneously; wherein, for each sub-pixel in the display device,

the curve establishing and updating process comprises the following steps:

detecting the actual brightness of the sub-pixel in real time;

establishing an actual brightness curve of the actual brightness values of the sub-pixels along with the change of the gray scale values according to the actual brightness values obtained by real-time detection, and updating the actual brightness curve;

the compensation process comprises the following steps:

acquiring an ideal brightness value corresponding to a gray-scale value to be output by the sub-pixel; wherein the ideal brightness value is a brightness value of the light emitting device in the sub-pixel when the light emitting device is not aged;

and calculating a gray-scale value corresponding to the actual brightness value equal to the acquired ideal brightness value according to the actual brightness curve of the sub-pixel, and taking the gray-scale value as an actually output gray-scale value.

2. The method of claim 1, wherein the step of establishing an actual luminance curve of the actual luminance values of the sub-pixels with gray-scale values according to the actual luminance values obtained by real-time detection and updating the actual luminance curve comprises:

in the initial stage, establishing an actual brightness curve according to an actual brightness value obtained by real-time detection;

and continuously updating the actual brightness curve according to the actual brightness value obtained by real-time detection based on the established actual brightness curve.

3. The luminance compensation method according to claim 2, wherein the step of establishing the actual luminance curve based on the actual luminance value detected in real time at the initial stage comprises:

s121: setting at least two marked gray-scale values;

s122: converting the actual brightness value obtained by real-time detection into a corresponding gray-scale value;

s123: judging whether the gray-scale value obtained by conversion is one of the at least two marked gray-scale values: if yes, recording the actual brightness value corresponding to the marked gray scale value, and entering step S124; if not, returning to the step S122;

s124: judging whether corresponding actual brightness values are recorded for all the marked gray-scale values: if yes, fitting according to all the marked gray-scale values and actual brightness values corresponding to the marked gray-scale values, and establishing an actual brightness curve; if not, return to step S122.

4. The luminance compensation method according to claim 3, wherein the step of continuously updating the actual luminance profile based on the established actual luminance profile according to the actual luminance values detected in real time includes:

s125: converting the actual brightness value obtained by real-time detection into a corresponding gray-scale value;

s126: judging whether the gray-scale value obtained by conversion is one of the at least two marked gray-scale values: if yes, updating the actual brightness value corresponding to the marked gray scale value to the actual brightness value obtained by current detection, and entering step S127; if not, returning to the step S125;

s127: and re-fitting the mark gray scale value and the updated actual brightness value corresponding to the mark gray scale value, and the rest mark gray scale values and the actual brightness values corresponding to the mark gray scale values to obtain the updated actual brightness curve, and returning to the step S125.

5. The luminance compensation method according to claim 4, wherein in step S124 and step S127, the fitting includes: and taking all the marked gray-scale values and the actual brightness values corresponding to the marked gray-scale values as a plurality of points on an actual brightness curve to be fitted, fitting each two adjacent points by adopting a linear function to obtain a line segment, and combining all the line segments obtained by fitting to obtain the actual brightness curve.

6. The luminance compensation method according to claim 5, wherein the step of calculating a gray level corresponding to the actual luminance value equal to the obtained ideal luminance value according to the actual luminance curve of the sub-pixel, and using the gray level as the actually output gray level comprises:

determining a line segment where a point corresponding to the acquired ideal brightness value on the actual brightness curve is located;

and calculating a gray level value corresponding to the actual brightness value equal to the acquired ideal brightness value according to the coordinate values of the two endpoints of the determined line segment.

7. The luminance compensation method as claimed in claim 3, wherein the number of the set marking gray-scale values is in a range of: greater than or equal to 2 and less than or equal to the maximum number of gray levels that can be displayed by the sub-pixels.

8. The luminance compensation method of claim 1, wherein the step of detecting the actual luminance of the sub-pixel in real time comprises:

sensing the brightness of the sub-pixels in real time;

acquiring the sensed brightness data at least twice within the time of one frame to obtain at least two groups of brightness data, and determining the photosensitive duration corresponding to each group of brightness data;

determining the time length required for sensing the brightness of the sub-pixel under the current gray scale according to the current gray scale of the sub-pixel, and recording the time length as t₀；

Selecting the light sensing time length closest to t from the at least two groups of brightness data₀The set of luminance data is used as the actual luminance of the current frame of the sub-pixel obtained by detection.

9. The luminance compensation method as claimed in claim 8, wherein the number of times of acquiring the sensed luminance data is 3 to 6 times within one frame, and 3 to 6 sets of the luminance data are obtained.

10. The method of claim 1, wherein the step of obtaining an ideal luminance value corresponding to the gray-scale value to be output by the sub-pixel comprises: and reading an ideal brightness curve of the ideal brightness value of the sub-pixel, which is stored in advance and changes along with the gray scale value, and finding out the ideal brightness value corresponding to the gray scale value to be output by the sub-pixel.

11. The luminance compensation method as claimed in claim 10, wherein the luminance compensation method further comprises a step of establishing the ideal luminance curve, the step comprising: and when the light-emitting device of the sub-pixel is not aged, testing the ideal brightness of the sub-pixel under different gray scales to obtain at least two groups of corresponding relation data of gray scale values and ideal brightness values, and fitting according to the at least two groups of corresponding relation data of the gray scale values and the ideal brightness values to obtain the ideal brightness curve.

12. A luminance compensation apparatus, characterized in that the luminance compensation apparatus comprises:

a plurality of photosensitive members respectively arranged corresponding to the plurality of sub-pixels of the display device, the photosensitive members being used for sensing the brightness of the corresponding sub-pixels in real time;

the first storage is connected with the photosensitive parts and used for establishing an actual brightness curve of the actual brightness value of each sub-pixel along with the change of the gray-scale value according to the real-time actual brightness value of each sub-pixel, updating the actual brightness curve and storing the latest actual brightness curve of each sub-pixel;

a second memory, in which an ideal brightness curve of the ideal brightness value of each sub-pixel along with the change of the gray scale value is stored; wherein the ideal brightness value is a brightness value of light emission when the light emitting devices in the corresponding sub-pixels are not aged;

and the compensation calculator is connected with the first memory and the second memory and used for finding out an ideal brightness value corresponding to the gray-scale value to be output by the corresponding sub-pixel from the ideal brightness curve of each sub-pixel, calculating a gray-scale value corresponding to the actual brightness value equal to the obtained ideal brightness value according to the actual brightness curve of the corresponding sub-pixel, and taking the gray-scale value as the gray-scale value which is actually output by the current frame of the corresponding sub-pixel.

13. The luminance compensation device according to claim 12, further comprising: and the actual brightness value judging component is connected between the photosensitive components and the first memory and is used for acquiring the sensed brightness data at least twice within one frame time for each photosensitive component to obtain at least two groups of brightness data, and selecting one group of brightness data from the at least two groups of brightness data as the actual brightness value of the current frame of the corresponding sub-pixel.

14. A computer product comprising one or more processors configured to execute computer instructions to perform one or more steps of the brightness compensation method according to any one of claims 1 to 11.

15. A display device characterized in that it comprises a brightness compensation device as claimed in claim 12 or 13.

16. A display substrate comprising a plurality of sub-pixels, the display substrate further comprising:

a plurality of photosensitive members, which are respectively arranged corresponding to the plurality of sub-pixels and are used for sensing the brightness of the corresponding sub-pixels in real time;

a plurality of driving lines, each of which is connected with the input end of at least one photosensitive member and is used for driving the corresponding photosensitive member to perform brightness induction;

and each induction line is connected with the output end of at least one photosensitive part and is used for acquiring brightness induction data of the corresponding photosensitive part.